JP6193662B2 - Reclining mechanism - Google Patents

Description

  The present invention relates to a reclining mechanism for adjusting an inclination angle of a seat back with respect to a seat cushion.

  In general, the reclining mechanism is disengaged from the base plate fixed to the seat cushion, the internal gear fixed to the seat back and rotatable with respect to the base plate, the lock position engaging with the internal gear, and the internal gear. A lock gear displaceable to the release position and a cam for pressing the lock gear toward the lock position are provided. There are various types of such reclining mechanisms, for example, a type in which a cam and a lock gear are supported so as to be linearly movable on the base plate (see Patent Document 1), and a cam and a lock gear can be rotated on the base plate. And a type in which the cam is rotatably supported by the base plate and a lock gear is supported by the base plate so as to be linearly movable (see Patent Document 3).

Japanese Patent No. 5195761 JP 2002-521165 A Japanese Patent No. 5189879

  By the way, the inventors of the present application have invented a reclining mechanism having a novel configuration that does not exist in the prior art.

  Accordingly, an object of the present invention is to provide a reclining mechanism having a new configuration different from the conventional one.

  Another object of the present invention is to suppress an increase in the number of parts and to firmly mesh the lock gear with the internal gear. It is another object of the present invention to maintain the lock gear in a locked posture and to easily engage a plurality of lock gears with the internal gear. Another object of the present invention is to simplify the reclining mechanism, to increase the rigidity of the guide portion, and to smoothly rotate the lock gear.

  The present invention for solving the above-described problems is a reclining mechanism for adjusting an inclination angle of a seat back with respect to a seat cushion, the base plate being fixed to one of the seat cushion and the seat back, the seat cushion, and the It is fixed to the other side of the seat back and can be rotated between an internal gear that can rotate with respect to the base plate, a locking posture that meshes with the internal gear, and a releasing posture that is disengaged from the internal gear. The lock gear is rotatably supported by the base plate, and is supported by the base plate so as to be movable along a predetermined line. By pressing the lock gear, the lock gear is brought into the lock posture or the release posture. And the slide cam to operate And an operation member for.

  Here, the “predetermined line” means a straight line or a curve.

  According to this, the reclining mechanism of the new structure different from the past can be provided.

  In the above-described configuration, the slide cam is configured to be movable between a first position that presses the lock gear toward the lock posture and a second position that presses the lock gear toward the release posture. May be.

  According to this, both the lock gear can be locked and released simply by pressing the lock gear with the slide cam, so that, for example, a spring for releasing the lock gear is unnecessary, and the increase in the number of parts is suppressed. Can do.

  In the above-described configuration, a first biasing member that biases the slide cam toward the first position may be provided.

  According to this, since the urging force of the first urging member can be transmitted to the lock gear via the slide cam, the lock gear can be firmly meshed with the internal gear.

  In the above-described configuration, the base plate may be fixed to the seat cushion, and the moving direction of the slide cam may be set in the vertical direction.

  According to this, when a force is applied to the seat back in the front-rear direction at the time of a collision, the force does not act on the slide cam in the moving direction, so that the slide cam moves in the release direction. And the lock gear can be maintained in the locked posture.

  In the above-described configuration, a plurality of the lock gears are provided, and are configured to mesh with the internal gear at different timings when the slide cam is moved from the second position toward the first position. May be.

  According to this, compared with a structure in which a plurality of lock gears are simultaneously meshed with an internal gear, for example, the plurality of lock gears can be easily meshed with the internal gear.

  Further, in the above-described configuration, the plurality of lock gears include a first lock gear and a second lock gear, and the slide cam includes a first pressing portion for pressing the first lock gear toward the lock posture. A second pressing portion for pressing the second lock gear toward the locking posture, and the first pressing in the moving direction of the slide cam when the slide cam is located at the second position. You may comprise so that the distance from a part to a said 1st lock gear may differ from the distance from a said 2nd press part to a said 2nd lock gear.

  According to this, the timing with which each lock gear meshes with the internal gear can be shifted with a simple structure.

  Further, in the above-described configuration, a first urging member that urges the lock gear toward the lock posture via the slide cam, and a second urging member that urges the lock gear toward the release posture; The slide cam includes a third position that presses the lock gear toward the lock posture, and a fourth position that allows the lock gear to rotate by the second biasing member away from the third position. And may be configured to be movable.

  According to this configuration, since the urging force of the first urging member can be transmitted to the lock gear via the slide cam, the lock gear can be firmly engaged with the internal gear.

  Further, in the above-described configuration, a third urging member that urges the lock gear toward the lock posture is provided, and the slide cam has a fifth position that presses the lock gear toward the release posture; You may be comprised so that it can move to the 6th position which leaves | separates from 5 positions and permits rotation of the said lock gear by the said 3rd biasing member.

  According to this configuration, since the urging force of the third urging member can be transmitted to the lock gear, the lock gear can be firmly meshed with the internal gear.

  Further, in the above-described configuration, the base plate has a slide surface that faces the slide cam in the axial direction of the internal gear, and the slide cam that protrudes from the slide surface and is orthogonal to the moving direction of the slide cam. The internal gear has a pair of guide portions that are arranged so as to sandwich the slide cam and that faces the base plate in the axial direction, and projects from the facing portion to the base plate side. Each guide portion may be provided with a rotation restricting portion that restricts the amount of rotation of the internal gear by restricting the movement of the protrusion.

  According to this, since the rotation restricting portion that restricts the movement of the protruding portion is provided in the guide portion, for example, the reclining mechanism can be simplified compared to a structure in which the rotation restricting portion is provided in a portion other than the guide portion. Can do.

  Moreover, in the above-described configuration, a convex portion that protrudes on the side opposite to the internal gear may be provided around the guide portion of the base plate.

  According to this, the rigidity of a guide part can be made high by a convex part.

  In the above-described configuration, a portion of the base plate facing the lock gear may be provided with a sliding resistance reducing unit for reducing the sliding resistance with the lock gear.

  According to this, since the sliding resistance between the lock gear and the base plate can be reduced, the lock gear can be smoothly rotated.

  According to the structure of Claim 1, the reclining mechanism of the new structure different from the past can be provided.

  According to the structure of Claim 2, the increase in a number of parts can be suppressed.

  According to the configuration of the third, seventh, and eighth aspects, the lock gear can be firmly meshed with the internal gear.

  According to the configuration of the fourth aspect, the lock gear can be maintained in the locked posture.

  According to the configuration of the fifth aspect, the plurality of lock gears can be easily meshed with the internal gear.

  According to the configuration of the sixth aspect, the timing at which each lock gear meshes with the internal gear can be shifted with a simple structure.

  According to the structure of Claim 9, simplification of a reclining mechanism can be achieved.

  According to the structure of Claim 10, the rigidity of a guide part can be made high by a convex part.

  According to the structure of Claim 11, rotation of a lock gear can be performed smoothly.

1 is a side view showing a vehicle seat provided with a reclining mechanism according to a first embodiment of the present invention. It is a disassembled perspective view which decomposes | disassembles and shows a reclining mechanism. It is sectional drawing which shows the reclining mechanism of a locked state. It is sectional drawing which shows the reclining mechanism of a cancellation | release state. It is the perspective view which looked at the internal gear from the inside. It is sectional drawing which shows the state by which the lock gear is hold | maintained in the cancellation | release state by the cancellation | release state holding part of the internal gear. It is sectional drawing which shows the state by which the lock gear is not hold | maintained in the cancellation | release state by the cancellation | release state holding part of the internal gear. It is the perspective view which looked at the base plate from the outside. It is sectional drawing (a) which shows the locked state of the reclining mechanism which concerns on 2nd Embodiment, and II sectional drawing (b) of Fig.9 (a). It is sectional drawing which shows the cancellation | release state of the reclining mechanism which concerns on 2nd Embodiment. It is sectional drawing which shows the cancellation | release state of the reclining mechanism which concerns on 3rd Embodiment. Sectional drawing (a) which shows the meshing timing with the internal gear of each lock gear of the reclining mechanism which concerns on 3rd Embodiment, The enlarged view (b) of A part of Fig.12 (a), Fig.12 (a) It is an enlarged view (c) of B part. It is sectional drawing which shows the cancellation | release state of the reclining mechanism which concerns on 4th Embodiment. It is sectional drawing which shows the locked state of the reclining mechanism which concerns on 4th Embodiment. It is sectional drawing which shows the cancellation | release state of the reclining mechanism which concerns on 5th Embodiment. It is sectional drawing which shows the locked state of the reclining mechanism which concerns on 5th Embodiment.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In the present invention, front and rear, left and right, and top and bottom are based on a passenger sitting on the vehicle seat S.

  As shown in FIG. 1, the reclining mechanism 1 is a mechanism for adjusting the inclination angle of the seat back S2 with respect to the seat cushion S1 of the vehicle seat S, and is provided on one side of the rear portion of the seat cushion S1 in the left-right direction. Yes. In the following description, it is assumed that the reclining mechanism 1 is provided on the right side of the seat cushion S1.

  The seat cushion S1 has a pair of cushion side frames F1 that are spaced apart from each other on the left and right, and the seat back S2 has a pair of back side frames F2 that are spaced apart from each other on the left and right. The lower end portion of each back side frame F2 overlaps with the rear end portion of the corresponding cushion side frame F1 when viewed from the left-right direction, and is disposed on the inner side in the left-right direction than the rear end portion. The reclining mechanism 1 is provided between the rear end portion of the right cushion side frame F1 and the lower end portion of the right back side frame F2.

  As shown in FIG. 2, the reclining mechanism 1 includes a base plate 10, two lock gears 20, a slide cam 30, a rotating cam 40 as an example of an operation member, an internal gear 50, a ring 60, A spiral spring SP as an example of one urging member is provided.

  The base plate 10 is fixed to a cushion side frame F1 (see FIG. 1) constituting the seat cushion S1. The internal gear 50 is rotatably supported by the base plate 10 via the ring 60, is fixed to the back side frame F2 (see FIG. 1) constituting the seat back S2, and rotates integrally with the seat back S2. It is supposed to be.

  The rotation of the internal gear 50 with respect to the base plate 10 is regulated (locked) or allowed (released) by the lock gear 20 operated by the slide cam 30 or the like disposed between the base plate 10 and the internal gear 50. It has become. As a result, the tilting of the seat back S2 relative to the seat cushion S1 can be restricted or allowed depending on the operating state of the lock gear 20 or the like. Below, each member is demonstrated in detail.

  The base plate 10 includes a disk-shaped base portion 11, a pair of guide portions 12 and a pair of upper bulge portions 13 that bulge from the base portion 11 to the left side (internal gear 50 side).

  A portion of the left surface of the base 11 sandwiched between the pair of guide portions 12 faces the slide cam 30 in the axial direction of the internal gear 50, and supports the slide cam 30 so as to be slidable in the vertical direction. It becomes the slide surface 11a. The slide surface 11 a is formed so as to extend upward and downward from the central portion of the base portion 11. In addition, a through hole 11 b for inserting the rotation shaft portion 41 of the rotation cam 40 is formed at the center of the base portion 11.

  The pair of guide portions 12 are portions that guide the slide cam 30 so as to be movable in the vertical direction, and are arranged so as to sandwich the slide surface 11a in the front-rear direction orthogonal to the movement direction of the slide cam 30. One rotation restricting portion 15 that bulges toward the left side is formed on the left surface of each guide portion 12. Each rotation restricting portion 15 is disposed at an equal distance from the rotation axis of the internal gear 50, and restricts the movement of the protruding portion 54 formed on the internal gear 50 in the circumferential direction, whereby The amount of rotation of the gear 50 is regulated (see FIGS. 6 and 7). Thereby, it is possible to regulate the amount of tilting of the seat back S2 that rotates integrally with the internal gear 50. Further, since the rotation restricting portion 15 is provided in the guide portion 12, for example, the reclining mechanism 1 can be simplified compared to a structure in which the rotation restricting portion is provided in a portion other than the guide portion.

  The upper bulging portions 13 are arranged on the upper side of the guide portions 12 with a space therebetween. And the outer peripheral surface 22 of the rotating shaft part 21 integrally formed in each lock gear 20 is each rotated in the lower part of the front-back direction outer side of each upper bulging part 13, and the upper part of the front-back direction outer side of each guide part 12. The bearing surface 14 which supports it is formed integrally. As described above, the outer peripheral surface 22 of the rotation shaft portion 21 formed integrally with the lock gear 20 is supported by the bearing surface 14 formed integrally with the base plate 10, for example, a shaft that is a separate member from the lock gear and the base plate. Compared to the configuration in which the lock gear can be rotated with respect to the base plate via the member, the reclining mechanism 1 can be easily configured.

  Specifically, as shown in FIG. 3, the outer peripheral surface 22 of the rotation shaft portion 21 is formed by an arcuate first outer peripheral surface 22 a centering on the rotation axis 21 </ b> A of the rotation shaft portion 21 and the rotation axis 21 </ b> A. On the other hand, it has an arcuate second outer peripheral surface 22b that is provided on the opposite side of the first outer peripheral surface 22a and that has a rotation axis 21A as the center. The first outer peripheral surface 22a is disposed on the upper side of the rotation axis 21A, and is formed so that the distance to the rotation axis 21A is larger than the distance from the second outer peripheral surface 22b to the rotation axis 21A. Yes. That is, the curvature radius of the first outer peripheral surface 22a is larger than the curvature radius of the second outer peripheral surface 22b.

  In each sectional view of FIG. 3 and the like, the rotating cam 40 is illustrated without being broken for convenience. 3 and 4, for convenience, illustration of a protruding portion 54 and a released state holding portion 55 of the internal gear 50 described later is omitted.

  On the other hand, the bearing surface 14 is formed in a shape that follows the first outer peripheral surface 22a, and has a shape that follows the first inner peripheral surface 14a that rotatably supports the first outer peripheral surface 22a and the second outer peripheral surface 22b. And a second inner peripheral surface 14b that rotatably supports the second outer peripheral surface 22b.

  On the outer side in the front-rear direction of the first outer peripheral surface 22a of the lock gear 20, a first concave portion 23a having a circular arc shape in cross section that is recessed toward the inner side of the lock gear 20 is formed adjacent to the inner peripheral surface of the first concave portion 23a. Is formed to be continuous with the first outer peripheral surface 22a. Similarly, a second concave portion 23b that is recessed toward the inner side of the lock gear 20 is formed adjacent to the second outer peripheral surface 22b of the lock gear 20 in the front-rear direction, and the inner peripheral surface of the second concave portion 23b. Is formed to be continuous with the second outer peripheral surface 22b.

  Thus, the area of each outer peripheral surface 22a, 22b can be increased, and the area of the bearing surface 14 can be increased in accordance with each outer peripheral surface 22a, 22b having a larger area. 22 can be favorably supported.

  A first regulated surface 22c extending from the end edge in a direction intersecting the first outer circumferential surface 22a, specifically, the lower side, is formed on the inner edge in the front-rear direction of the first outer circumferential surface 22a. Further, a second regulated surface 22d extending in a direction intersecting the second outer peripheral surface 22b from the end edge, specifically, upward is formed at the inner edge in the front-rear direction of the second outer peripheral surface 22b.

  On the other hand, a first regulating surface 14c extending in the direction intersecting the first inner peripheral surface 14a from the end edge, specifically, the lower side, is formed at the inner edge in the front-rear direction of the first inner peripheral surface 14a. Further, a second regulating surface 14d extending in the direction intersecting with the second inner peripheral surface 14b from the end edge, specifically, upward is formed on the inner edge in the front-rear direction of the second inner peripheral surface 14b.

  The first restricting surface 14c is a surface for restricting the first restricted surface 22c from moving inward in the front-rear direction (in the direction away from the internal gear 50), and inward in the front-rear direction of the first restricted surface 22c. It arrange | positions and is facing the said 1st to-be-regulated surface 22c, adjoining in the front-back direction. The second restricting surface 14d is a surface that restricts the movement of the second restricted surface 22d inward in the front-rear direction (the direction away from the internal gear 50), and inward in the front-rear direction of the second restricted surface 22d. It is arranged and faces the second regulated surface 22d in close proximity in the front-rear direction.

  The distance between the first restricted surface 22c and the first restricted surface 14c is smaller than the distance between the second restricted surface 22d and the second restricted surface 14d when the lock gear 20 is in the locked posture shown in FIG. Is set to More specifically, when the lock gear 20 is in the locked posture, the first regulated surface 22c comes into contact with the first regulating surface 14c, and the second regulated surface 22d is separated from the second regulating surface 14d.

  By configuring each surface in this manner, for example, when a large force is applied to the vehicle seat S during a collision, the movement of the first regulated surface 22c is regulated by the first regulating surface 14c. The engagement state between the lock gear 20 and the internal gear 50 can be maintained.

  More specifically, as described above, the first regulated surface 22c whose movement is regulated by the first regulating surface 14c is such that the distance from the first outer circumferential surface 22a to the rotational axis 21A is the rotational axis from the second outer circumferential surface 22b. By being configured to be larger than the distance to 21A, it is formed with a larger area than the second regulated surface 22d. Moreover, each control surface 14c, 14d which controls the movement of each control surface 22c, 22d is formed in the magnitude | size matched with the corresponding control surface 22c, 22d, and the 1st control surface 14c is 2nd. The area is larger than the regulation surface 14d.

  Thus, the first restricted surface 22c and the first restricted surface 14c that are close to each other in the locked posture are made larger than the second restricted surface 22d and the second restricted surface 14d. When a large force is applied to the sheet S, the movement of the large first regulated surface 22c can be regulated by the large first regulating surface 14c, so that the engagement state of the lock gear 20 and the internal gear 50 is maintained. It is possible.

  Further, since the second restricted surface 22d and the second restricted surface 14d are provided, for example, even when the first restricted surface 22c or the first restricted surface 14c is deformed and the lock gear 20 moves during a collision. The engagement state of the lock gear 20 and the internal gear 50 can be maintained by the contact between the second regulated surface 22d and the second regulating surface 14d.

  The lock gear 20 is provided one by one across the slide cam 30 in the front-rear direction orthogonal to the moving direction of the slide cam 30 and is engaged with the internal gear 50 and the released posture released from the internal gear 50 (see FIG. 4), the base plate 10 is rotatably supported. The lock gear 20 is formed in a long shape extending along the circumferential direction of the internal gear 50, and the upper end portion and the lower end portion are disposed on the movement locus of the slide cam 30. It faces each end in the moving direction. The lock gear 20 includes the rotation shaft portion 21 described above, a first arc-shaped first extension portion 24 extending downward from the rotation shaft portion 21 along the inner peripheral surface of the internal gear 50, and the rotation shaft portion 21. And a second extending portion 25 extending inward in the front-rear direction (in a direction away from the internal gear 50).

  A plurality of gear teeth 24 a that mesh with a plurality of inner teeth 51 formed on the internal gear 50 are provided on the outer peripheral surface of the first extension portion 24. When the lock gear 20 is in the locked posture, the front end portion of the first extension portion 24 is slanted from the upper end of the first surface 24b to the outer side in the front-rear direction and the upper side. And a second surface 24d extending upward from an end on the outer side in the front-rear direction of the inclined surface 24c. Corners and corners between the surfaces 24b to 24d are formed in a gentle R shape (curved surface shape).

  The inclined surface 24 c is pressed downward by the slide cam 30, so that the lock gear 20 is locked to the internal gear 50. More specifically, when the lock gear 20 is in the locked posture, a contact portion between the slide cam 30 and the inclined surface 24c, a contact portion between the one or more gear teeth 24a and the inner teeth 51 that contact the gear teeth 24a, The lock gear 20 is supported at three locations by the contact portion between the first regulated surface 22c and the first regulating surface 14c.

  Further, an arc-shaped protrusion 26 protruding leftward from the surface is formed on the left surface of the first extending portion 24 so as to follow the inner peripheral surface of the internal gear 50 (see also FIG. 2).

  The second extending portions 25 formed in the respective lock gears 20 are formed so as to extend from the respective rotating shaft portions 21 so as to approach each other, and when the respective lock gears 20 are in the locked posture, the respective second extending portions 25 are Is configured to be smaller than the meshing amount between the lock gear 20 and the internal gear 50. As a result, the first restriction surface 14c is deformed due to a strong force at the time of collision, and the movement of the first restricted surface 22c cannot be restricted. The engagement between the lock gear 20 and the internal gear 50 can be maintained by contact between the protruding portions 25.

  The slide cam 30 is a substantially rectangular plate-like member that is long in the vertical direction, and is supported between the pair of guide portions 12 so as to be linearly movable in the vertical direction. The slide cam 30 has a first position (hereinafter also referred to as a lock position) that presses the lock gear 20 toward the lock posture by pressing the tip of the first extension portion 24 of the lock gear 20 at the lower end, and the upper end. By pressing the distal end portion of the second extending portion 25 of the lock gear 20 with the portion, the lock gear 20 can be moved to a second position (the position in FIG. 4, hereinafter also referred to as a release position) that presses the lock gear 20 toward the release posture. It is configured.

  According to this, since the lock gear 20 can be locked / released only by pressing the lock gear 20 with the slide cam 30, for example, a spring for releasing the lock gear becomes unnecessary, and the number of parts increases. Can be suppressed. Moreover, since it comprised so that the both ends of the longitudinal direction of the lock gear 20 might be pressed with the slide cam 30, compared with the structure which presses the center part of the longitudinal direction of a lock gear with a slide cam, the lock gear 20 becomes easy to rotate, The lock gear 20 can be locked or released satisfactorily.

  Further, since the lock gear 20 is pressed at each end of the slide cam 30 in the moving direction, for example, compared to a structure in which the lock gear is pressed at the center of the slide cam in the moving direction, the lock gear is moved from each end of the slide cam 30 in the moving direction. The force can be efficiently transmitted to 20 and an increase in the size of the slide cam 30 can be suppressed. Further, since the moving direction of the slide cam 30 is set in the vertical direction, when a force is applied in the front-rear direction to the seat back S2 at the time of a collision, the force is transferred via the internal gear 50 and the lock gear 20 to the slide cam 30. 30 is added in a direction orthogonal to the moving direction. Therefore, it is possible to suppress the slide cam 30 from moving in the release direction, and thus the lock gear 20 can be maintained in the locked posture.

  The lower end of the slide cam 30 has a pair of first contacts that abut (slidably contact) the inclined surfaces 24c of the lock gears 20 while the slide cam 30 moves from the release position to a position slightly before the lock position. A contact surface 31 and a pair of second contact surfaces 32 that contact each inclined surface 24c of each lock gear 20 when the slide cam 30 is positioned at the lock position are provided. A pair of guided surfaces 33 guided by the respective guide portions 12 are formed on both front and rear sides of the slide cam 30 so as to extend in the vertical direction.

  Each first contact surface 31 is formed so as to incline in a direction approaching each other as it goes downward, and is connected at the center in the front-rear direction of the slide cam 30. A first connection surface 34 that connects the first contact surface 31 and the second contact surface 32 is formed on the outer edge in the front-rear direction of each first contact surface 31 so as to extend upward. Yes. The first connecting surface 34 is not in contact with the lock gear 20 when the lock gear 20 is in the locked posture.

  Each second contact surface 32 is formed so as to be inclined upward and outward in the front-rear direction from the upper end of each first connection surface 34. Thus, each 2nd contact surface 32 inclines and is formed, and each 2nd contact surface 32 is made into the lower edge part (R between 1st surface 24b and inclined surface 24c) of each lock gear 20. Since each of the lock gears 20 can be firmly locked to the internal gear 50 by the wedge effect.

  Further, each of the second contact surfaces 32 has a slide cam so as to coincide with an R-shaped corner between the first surface 24b and the inclined surface 24c of each lock gear 20 when each lock gear 20 is in the locked posture. The curved shape is recessed toward the inside of 30. Thereby, when each lock gear 20 is in the locked posture, the contact area between each curved second contact surface 32 and the R-shaped corner of each lock gear 20 is increased, so that the locked state can be stabilized. It has become.

  A second connecting surface 35 that connects the second abutting surface 32 and the guided surface 33 extends upward at the outer edge in the front-rear direction of each second abutting surface 32, and then gradually outwards in the front-rear direction. It is formed to be curved.

  A portion on the lower end side of each guided surface 33 is a facing surface 33a that faces the second surface 24d of each lock gear 20 in the front-rear direction when each lock gear 20 is in the locked posture. The facing surface 33a is disposed in a non-contact state with the lock gear 20 when the lock gear 20 is in the locked posture, and the distance between the facing surface 33a and the second surface 24d is the lock gear 20 when the lock gear 20 is in the locked posture. And the internal gear 50 are set to be smaller than the meshing amount.

  Thus, even when the lock gear 20 in the locked posture moves during a collision, the engagement state between the lock gear 20 and the internal gear 50 can be maintained by the contact between the facing surface 33a and the second surface 24d. It is possible. Further, since the facing surface 33a and the lock gear 20 are not in contact with each other, even when there are product errors or assembly errors in the components such as the lock gear 20 and the slide cam 30, the slide cam 30 is moved in the locking direction. Since the opposed surface 33a and the lock gear 20 do not interfere with each other, only the second contact surfaces 32 of the slide cam 30 can be brought into contact with the lock gears 20 at the time of locking, and the lock gears 20 can be easily engaged with the internal gear 50. be able to.

  Further, the length L1 between the respective edges on the outer side in the front-rear direction of each second contact surface 32 described above is smaller than the interval L2 between the opposing surfaces 33a. As a result, each of the second contact surfaces 32 and each of the first contact surfaces 31 arranged on the inner side in the front-rear direction than the second contact surfaces 32 can easily enter between the lock gears 20. It can be smoothly rotated to the locked posture.

  Further, when each lock gear 20 is in the release posture, a gap is formed between the lower end portion of the slide cam 30 and the tip end portion of the first extension portion 24 of each lock gear 20. Thereby, it is possible to smoothly start the slide cam 30 from the release position to the lock position.

  The upper end portion 36 of the slide cam 30 is formed in a tapered shape that gradually becomes narrower as it goes upward, and the corner portion of the upper end is formed in a gentle R shape. When the slide cam 30 is moved from the lock position to the release position, the upper end portion 36 abuts on the distal end portion of the second extending portion 25 of each lock gear 20 and presses the distal end portion upward. The lock gear 20 rotates from the locked posture to the released posture.

  As shown in FIG. 2, the left surface of the slide cam 30 is provided with a convex portion 37 that protrudes to the left from the surface and engages with the slot 44 of the rotating cam 40. In addition, an elongated hole 38 that is long in the vertical direction is formed in a substantially central portion of the slide cam 30 so as to penetrate the rotation shaft portion 41 of the rotation cam 40 in the left-right direction and to allow the slide cam 30 to move. ing.

  The rotation cam 40 is a member for moving the slide cam 30 upward, and is configured to rotate in conjunction with an operation lever (not shown) operated by an occupant. The rotation cam 40 is rotatably supported by the through hole 11b of the base plate 10 and the left end portion of the rotation shaft portion 41 is directed radially outward of the rotation shaft portion 41. And a cam plate portion 42 that extends.

  The rotation shaft portion 41 is formed in a substantially cylindrical shape that protrudes to the right side of the base plate 10 through the long hole 38 of the slide cam 30 and the through hole 11 b of the base plate 10. A part of the outer peripheral surface of the rotating shaft portion 41 is formed as a spring hook portion 41a formed in a flat shape.

  The inner end of the spiral spring SP is engaged with the spring hook 41a, and the rotating cam 40 is always urged in the locking direction (counterclockwise direction in FIG. 3) by the spiral spring SP. Yes. The rotating cam 40 is formed with a hexagonal hole 43 that penetrates the rotating shaft portion 41 and the cam plate portion 42, and the hexagonal hole 43 is interlocked with an operation lever (not shown) or the operation lever. The mechanism is engaged.

  The cam plate portion 42 is formed with a substantially V-shaped slot 44 in which the convex portion 37 of the slide cam 30 enters and engages at a position away from the rotational center of the rotational cam 40. As shown in FIG. 3, the slot 44 extends in the counterclockwise direction from the first slot 44a extending along the substantially radial direction of the internal gear 50 and the radially outer end of the first slot 44a. A second slot 44b.

  The first slot 44a pushes the convex portion 37 downward when the rotating cam 40 is rotated in the locking direction (counterclockwise direction), and moves the slide cam 30 to the locking position. When 40 is rotated in the release direction (clockwise direction), the convex portion 37 is pressed upward to move the slide cam 30 to the release position.

  The second slot 44b rotates the rotating cam 40 further in the release direction after the slide cam 30 is located at the release position, that is, after the convex portion 37 is located at the radially outer end of the first slot 44a. It is formed in such a shape that the convex portion 37 is not moved up and down when being moved. Specifically, the second slot 44b is formed in a shape including a relative movement locus (arc-like locus) of the convex portion 37 positioned at the radially outer end of the first slot 44a with respect to the rotating cam 40. Has been. And the edge part on the opposite side to the 1st slot 44a of the 2nd slot 44b is set to the position where a space | gap is left between the convex parts 37, when a passenger | crew pulls an operation lever. (See FIG. 4).

  By forming the second slot 44b as described above, the first cam slot 44a presses the convex portion 37 upward, and the slide cam 30 is positioned at the release position. Even if it is rotated, the convex portion 37 can be prevented from further moving by the second slot 44b, so that it is possible to prevent an excessive load from being applied to the reclining mechanism 1. Yes.

  As shown in FIGS. 2 and 5, the internal gear 50 protrudes toward the base plate 10 from the disc portion 52 as an example of a facing portion that faces the base plate 10 in the axial direction and the outer peripheral portion of the disc portion 52. And a ring-shaped inner tooth forming portion 53 having inner teeth 51 on the inner peripheral side.

  The disc part 52 is a part that forms a housing for housing the lock gear 20, the slide cam 30, and the rotating cam 40 with the base plate 10, and includes a first holding part 52a and the first holding part 52a. And a second holding portion 52b disposed on the radially inner side.

  The first holding portion 52 a is formed in a ring shape centering on the axis of the internal gear 50, and holds each lock gear 20 by sandwiching it with the base plate 10. In the first holding portion 52a, four arc-shaped concave portions 56 that are recessed toward the left side are formed in an arc shape centering on the axis of the internal gear 50, and are arranged at equal intervals in the circumferential direction. ing. Thereby, since the rigidity of the internal gear 50 can be increased, the lock gear 20 and the like can be favorably held between the internal gear 50 and the base plate 10.

  The second holding portion 52b is formed in a bottomed cylindrical shape that is recessed toward the opposite side of the base plate 10 relative to the first holding portion 52a, and the slide cam 30 and the rotating cam 40 are sandwiched between the second holding portion 52b and the base plate 10. Is holding in.

  On the bottom surface of the second holding portion 52b, a protruding portion 54 that is in contact with each rotation restricting portion 15 of the base plate 10 in the circumferential direction is formed so as to protrude toward the base plate 10 side. The first holding portion 52a is formed with a release state holding portion 55 that protrudes from the first holding portion 52a toward the base plate 10 side.

  The released state holding portion 55 is a part for holding each lock gear 20 in the released state until the seat back S2 is in the slightly raised state from the state where the seat back S2 is most forwardly tilted, and the axial direction of the internal gear 50 It is formed in a substantially trapezoidal shape when viewed from above. The release state holding portion 55 is formed in a wedge shape that tapers as the tip end portion 55a on the downstream side in the rotational direction of the internal gear 50 moves toward the downstream side when the seat back S2 is tilted forward. Specifically, the radially inner surface of the distal end portion 55a (the shaft-side surface of the internal gear 50) is formed so as to incline radially outward toward the downstream side in the rotational direction.

  A support surface 55 b for supporting the arc-shaped protrusion 26 of the lock gear 20 from the radially outer side is formed along the outer peripheral surface of the arc-shaped protrusion 26 on the radially inner side of the released state holding portion 55. As shown in FIG. 7, when each lock gear 20 is in the release posture, the tip of the release state holding portion 55 (tip of the tip portion 55 a) is arranged at a position radially outside the arc-shaped protrusion 26 of the lock gear 20. The support surface 55b is disposed on the radially inner side of the outer peripheral surface of the arc-shaped protrusion 26.

  As a result, when the release state holding portion 55 is moved counterclockwise from the position shown in FIG. 7 when each lock gear 20 is in the release posture, the front arc-shaped projection 26 is moved inward by the wedge-shaped tip portion 55a. The front lock gear 20 is slightly rotated counterclockwise from the released posture. The front-side lock gear 20 that rotates in this manner slightly pushes up the slide cam 30 upward, and the slide cam 30 that moves upward slightly pushes up the upper end of the rear-side lock gear 20, and the rear-side lock gear 20. Is slightly rotated clockwise. For this reason, while the lock gear 20 on the front side is held by the release state holding portion 55, each lock gear 20 is in a position farther from the internal gear 50 than the release position (position in FIG. 7). It is possible to hold the release state better.

  In this way, the occupant can operate the operation lever by supporting the outer peripheral surface of the arcuate protrusion 26 on the front side by the release state holding portion 55 until the seat back S2 is in the state where the seatback S2 is tilted forward most. Even without operating the seat back S2, it is possible to freely tilt the seat back S2 in a range between a state where the seat back S2 is tilted forward and a state where it is slightly raised. Further, since the distal end portion 55a of the release state holding portion 55 is formed in a wedge shape, the release state holding portion 55 is moved counterclockwise in the figure from a position deviated from the arcuate protrusion 26 (for example, the position in FIG. 7). Thus, even when the lock gear 20 is inclined slightly toward the lock posture from the release posture, the lock gear 20 is rotated in the release direction by the wedge-shaped tip 55a. Can be made. Therefore, the lock gear 20 can be satisfactorily held in the release state by the release state holding unit 55. In particular, in this embodiment, since the upper end portion of the arc-shaped protrusion 26 is formed in an R shape, the lock gear 20 can be rotated more smoothly in the release direction by the wedge-shaped tip portion 55a. .

  As shown in FIGS. 2 and 8, the spiral spring SP is a spring that urges the slide cam 30 toward the lock position via the rotating cam 40, and an inner end portion of the spiral cam SP rotates the rotating cam 40. The outer end of the moving shaft 41 is engaged with the spring engaging portion 16 protruding from the right surface of the base plate 10. Thereby, the urging force of the spiral spring SP can be transmitted to each lock gear 20 via the rotating cam 40 and the slide cam 30, so that each lock gear 20 can be firmly engaged with the internal gear 50. ing.

  Further, the base plate 10 has three arcuate bulging portions 17 that project from the right side surface and that are formed in an arc shape around the axis of the base plate 10 or an example of the sliding resistance reducing portion, They are arranged so as to be arranged at intervals in the circumferential direction. Thereby, since the rigidity of the base plate 10 can be increased, the lock gear 20 and the like can be favorably held between the internal gear 50 and the base plate 10.

  The upper two arcuate bulging portions 17 among the three are provided adjacent to the periphery of each guide portion 12, specifically, the outer side in the front-rear direction. Thereby, since each arcuate bulging portion 17 can increase the rigidity of each guide portion 12, the slide cam 30 can be favorably guided by each guide portion 12.

  Further, the two arcuate bulging portions 17 described above are formed so as to bulge to the opposite side of each lock gear 20 at a position facing each lock gear 20 of the base plate 10. Thereby, since the sliding resistance between each lock gear 20 and the base plate 10 can be reduced, each lock gear 20 can be smoothly rotated.

Next, the operation of the reclining mechanism 1 will be described in detail.
As shown in FIG. 3, when the occupant operates the operation lever in the releasing direction against the urging force of the spiral spring SP in a state where each lock gear 20 is in the locked posture, the rotating cam 40 rotates clockwise in the figure. As a result, the convex portion 37 is pushed upward by the first slot 44a of the rotating cam 40, and the slide cam 30 moves upward from the lock position.

  After that, as shown in FIG. 4, the upper end portion 36 of the slide cam 30 that moves upward is brought into contact with the distal end portion of the second extending portion 25 of each lock gear 20 to push the distal end portion upward. Each lock gear 20 rotates from the lock posture toward the release posture, and when the slide cam 30 reaches the release position, each lock gear 20 is in the release posture. Here, even when the slide cam 30 reaches the release position, when the turning cam 40 turns clockwise in the drawing direction by the occupant in the release direction, the convex portion 37 moves by the second slot 44b. Therefore, only the rotation cam 40 can be rotated while the slide cam 30 is held at the release position. Thereby, when the occupant pulls the operation lever, it is possible to suppress an excessive load from being applied to the reclining mechanism 1.

  Further, when the occupant releases the hand from the operation lever in the state where each lock gear 20 is in the release posture, the rotating cam 40 is rotated counterclockwise in the figure by the urging force of the spiral spring SP, and the rotating cam 40 The convex portion 37 is pushed downward by the first slot 44a, and the slide cam 30 moves downward. The slide cam 30 that moves downward first pushes the inclined surfaces 24c of the lock gears 20 downward at the outer ends of the first contact surfaces 31 in the front-rear direction, so that the lock gears 20 are changed from the release posture to the lock posture. Rotate toward.

  Thereafter, when the lock gears 20 are in a substantially locked posture, the end portions on the outer sides in the front-rear direction of the first contact surfaces 31 of the slide cam 30 (corner portions between the first contact surfaces 31 and the first connection surfaces 34). Is disengaged from the inclined surface 24 c of each lock gear 20 and enters between the first surfaces 24 b of each lock gear 20. Thereby, each 2nd contact surface 32 of the slide cam 30 moves so that it may approach the inclined surface 24c of each lock gear 20, and by entering between each inclined surface 24c (R-shaped corner | angular part), Each lock gear 20 is firmly held in the locked posture by the wedge effect of each second contact surface 32.

  As shown in FIG. 6, when the occupant tilts the seat back S2 forward while the lock gears 20 are in the release posture, the protruding portion 54 of the internal gear 50 becomes the rear rotation restricting portion 15. When the seat back S2 comes into contact with the seat back, the tilt of the seat back S2 toward the front side is restricted. In this state, each lock gear 20 is held in the release posture by the release state holding portion 55, so that each lock gear 20 is held in the release posture even if the occupant releases his hand from the operation lever. As a result, the occupant can move the seat back S2 without operating the operation lever until the seat back S2 is raised a little from the most forward position.

  Further, as shown in FIG. 7, when the occupant tilts the seat back S2 rearward when each lock gear 20 is in the release posture, the protruding portion 54 of the internal gear 50 becomes the front rotation restricting portion 15. The rearward tilting of the seat back S2 is restricted when it comes into contact.

  Further, as shown in FIG. 3, when the lock gear 20 is in the locked posture, when a collision load is applied to the vehicle seat S and the upper portion of the lock gear 20 moves inward, the first regulated surface Since the movement of 22c is regulated by the first regulating surface 14c, the engagement state between the upper part of the lock gear 20 and the internal gear 50 can be maintained. Further, at this time, the first regulated surface 22c and the first regulating surface 14c for regulating the movement of the upper portion of the lock gear 20 are formed larger than the second regulated surface 22d and the second regulating surface 14d. Since the movement of the large first regulated surface 22c can be regulated by the large first regulating surface 14c, the engagement state between the upper portion of the lock gear 20 and the internal gear 50 can be maintained.

  In addition, when the first restricted surface 22c or the first restricted surface 14c is deformed and the upper portion of the lock gear 20 moves inward during a collision, the contact between the second restricted surface 22d and the second restricted surface 14d occurs. The engaged state between the upper portion of the lock gear 20 and the internal gear 50 can be maintained by contact or contact between the second extending portions 25 of the lock gears 20.

  Further, even when the lower part of the lock gear 20 in the locked posture moves at the time of a collision, the lower side of the lock gear 20 is brought into contact with each opposing surface 33a of the slide cam 30 and the second surface 24d of each lock gear 20. The engagement state between the portion and the internal gear 50 can be maintained.

  Further, when a force is applied in the front-rear direction to the seat back S2 at the time of a collision, the force is applied to the internal gear 50 and the lock gear 20 because the moving direction of the slide cam 30 is set to the vertical direction. And is applied to the slide cam 30 in a direction perpendicular to the moving direction thereof. For this reason, it is possible to suppress the slide cam 30 from moving in the releasing direction, so that the engagement state between the lock gear 20 and the internal gear 50 can be maintained.

  As mentioned above, according to this embodiment, the reclining mechanism 1 of the new structure different from the past can be provided.

[Second Embodiment]
Next, a second embodiment of the present invention will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 9A, the reclining mechanism 2 includes a base plate 100, two lock gears 200, a slide cam 300, a rotation shaft 400 as an example of an operation member, and an internal gear 500. And a compression coil spring SP2 as an example of a first urging member. The base plate 100 is fixed to a cushion side frame F1 constituting the seat cushion S1. The internal gear 500 is rotatably supported by the base plate 100 via a ring, is fixed to the back side frame F2 constituting the seat back S2, and rotates integrally with the seat back S2. .

  The rotation of the internal gear 500 with respect to the base plate 100 is regulated (locked) or allowed (released) by the lock gear 200 operated by the slide cam 300 or the like disposed between the base plate 100 and the internal gear 500. It has become. As a result, the tilting of the seat back S2 relative to the seat cushion S1 can be restricted or allowed depending on the operating state of the lock gear 200 or the like. Below, each member is demonstrated in detail.

  The base plate 100 includes a disk-shaped base portion 110 and a pair of guide portions 120 and a coupling portion 130 that bulge from the base portion 110 to the left side (internal gear 500 side).

  A portion sandwiched between the pair of guide portions 120 in the left side surface of the base portion 110 faces the slide cam 300 in the axial direction of the internal gear 500, and a slide surface 111 for slidably supporting the slide cam 300. It has become. The slide surface 111 is formed so as to extend upward and downward from the central portion of the base 110.

  The pair of guide portions 120 are portions that guide the slide cam 300 so as to be movable in the vertical direction, and are arranged so as to sandwich the slide surface 111 in the front-rear direction orthogonal to the movement direction of the slide cam 300. And the lower end part of each guide part 120 is couple | bonded by the coupling | bond part 130. FIG.

  Thereby, since the rigidity of each guide part 120 can be raised by the coupling | bond part 130, it is possible to support the slide cam 300 favorably by each guide part 120 with high rigidity.

  Further, the pair of guide portions 120 and the coupling portion 130 are provided with arc-shaped recesses 140 for allowing the protrusions 540 formed on the internal gear 500 to move in the rotational direction of the internal gear 500. Yes. The protrusion 540 of the internal gear 500 enters the recess 140, and movement is restricted by both end portions 141 and 142 in the rotation direction of the recess 140.

  Thereby, it is possible to regulate the tilting amount of the seat back S2 that rotates integrally with the internal gear 500. In addition, by adopting a configuration in which the protruding portion 540 is inserted into the recess 140 in this way, for example, the pair of rotation restricting portions 15 that restrict the movement of the protruding portion 54 as in the first embodiment are used as a pair of guide portions. The reclining mechanism 2 can be reduced in size in the axial direction as compared with the structure formed so as to protrude from the side 12 to the internal gear 50 side.

  The lock gears 200 are provided one by one across the slide cam 300 in the front-rear direction orthogonal to the moving direction of the slide cam 300, and the lower ends thereof are rotatably supported by the support shaft 150 fixed to the base plate 100. Yes. That is, the lock gear 200 is rotatably supported by the base plate 100 via the support shaft 150.

  The lock gear 200 can be rotated between a locked posture (the posture shown in FIG. 9A) meshed with the internal gear 500 and a release posture (the posture shown in FIG. 10) released from the internal gear 500. Specifically, the lock gear 200 includes a substantially arc-shaped first extending portion 210 that extends upward from the support shaft 150 along the circumferential direction of the internal gear 500, and an inner side in the front-rear direction from the upper end portion of the first extending portion 210 ( And a second extending portion 220 extending in a direction away from the internal gear 500.

  A part of the outer peripheral surface of the first extending portion 210 is provided with a plurality of gear teeth 211 that mesh with a plurality of inner teeth 510 formed on the internal gear 500. The second extending portion 220 is formed so as to extend inward in the front-rear direction from the upper end portion of the first extending portion 210, and then obliquely extend upward and inward in the front-rear direction, and the tip end portion thereof is tapered. ing.

  The second extending portion 220 has an engaging surface 221, a lock-side pressed surface 222, and a connecting surface 223 that connects the engaging surface 221 and the lock-side pressed surface 222 on the lower side (inward in the radial direction). And a release-side pressed surface 224 on the upper side (radially outer side).

  The engagement surface 221 is a surface that first comes into contact with the slide cam 300 when the lock gear 200 in the release posture (posture of FIG. 10) is pressed upward by the slide cam 300, and is inclined inward in the front-rear direction as it goes upward. It is formed to do. When the lock gear 200 is in the release posture, the engagement surface 221 is disposed so as to be opposed to and close to a contact surface 312 of a slide cam 300 described later.

  The lock-side pressed surface 222 is a surface that receives a pressing force from the slide cam 300 when the lock gear 200 is in the locked posture, and is disposed at a position on the inner side in the front-rear direction and on the upper side than the engagement surface 221. Yes. The lock-side pressed surface 222 is formed so as to incline in the front-rear direction as it goes upward, so that the lock-side pressed surface 313 of the slide cam 300 (described later) is vertically aligned regardless of the posture of the lock gear 200. It is arranged at the opposite position.

  When the lock gear 200 is in the locked posture, the connecting surface 223 extends upward from the edge on the inner side in the front-rear direction of the engagement surface 221 along the vertical direction, and then curves inward in the front-rear direction to be locked-side pressed surface. 222 to be coupled to 222.

  The release-side pressed surface 224 is a surface that comes into contact with the slide cam 300 when the lock gear 200 in the locked posture is pressed downward by the slide cam 300, and is formed to incline in the front-rear direction as it goes upward. Yes. The release-side pressed surface 224 is disposed at a position facing a contact portion 332 of the slide cam 300 described later in the vertical direction regardless of the posture of the lock gear 200.

  The slide cam 300 is supported between the pair of guide portions 120 so as to be linearly movable in the vertical direction. The slide cam 300 presses the lock-side pressed surface 222 of the lock gear 200 upward to press the lock gear 200 toward the lock position (the position in FIG. 9A), and the release-side cover of the lock gear 200. By pressing the pressing surface 224 downward, it is configured to be movable to a release position (position in FIG. 10) that presses the lock gear 200 toward the release posture.

  According to this, since the lock gear 200 can be locked and released only by pressing the lock gear 200 with the slide cam 300, for example, a spring or the like for releasing the lock gear becomes unnecessary, and the number of parts increases. Can be suppressed. Further, since the slide cam 300 is configured to press one end portion of the lock gear 200 in the longitudinal direction, the lock gear 200 can be easily rotated as compared with a structure in which the center portion in the longitudinal direction of the lock gear is pressed by the slide cam, for example. The lock gear 200 can be locked or released satisfactorily.

  Further, since the moving direction of the slide cam 300 is set to the vertical direction, when a force is applied in the front-rear direction to the seat back S2 at the time of a collision, the force is transferred via the internal gear 500 and the lock gear 200. 300 is added in a direction orthogonal to the moving direction. Therefore, the slide cam 300 can be prevented from moving in the release direction, so that the lock gear 200 can be maintained in the locked posture.

  Specifically, the slide cam 300 includes a substantially rectangular slide portion 310 that is long in the vertical direction, a connecting portion 320 that extends upward from the upper end of the slide portion 310, and a release side that extends outward in the front-rear direction from the upper end of the connecting portion 320. And a pressing portion 330.

  The slide portion 310 includes a pair of guided surfaces 311 guided by the guide portions 120, a pair of contact surfaces 312 formed so as to be inclined upward and inward in the front-rear direction from the upper end of each guided surface 311; And a pair of lock-side pressing surfaces 313.

  The contact surface 312 is a surface that comes into contact with the engagement surface 221 of the lock gear 200 in the initial stage of pressing the lock gear 200 in the release posture upward by the slide cam 300, and when the lock gear 200 is in the release posture, In addition to being parallel to the engagement surface 221 of 200, it is disposed close to the engagement surface 221.

  The lock-side pressing surface 313 is a surface that presses the lock-side pressed surface 222 of the lock gear 200 when the lock gear 200 is in the locked posture, and is located on the inner side in the front-rear direction and on the upper side of the contact surface 312. Has been placed. Specifically, a connecting surface (reference numeral is omitted) is formed on the outer edge in the front-rear direction of the lock-side pressing surface 313, extending substantially downward and then bending outward in the front-rear direction to connect to the contact surface 312. A corner between the coupling surface and the lock-side pressing surface 313 is formed in an R shape. And the corner | angular part (end part of the front-back direction outer side of the lock side press surface 313) used as this R shape contact | abuts to the lock side pressed surface 222. FIG.

  In addition, a long hole 314 is formed in the lower portion of the slide portion 310 along the vertical direction for allowing the rotation shaft 400 to penetrate in the left-right direction and allowing the slide cam 300 to move. In addition, an engagement groove hole 315 that can be engaged with an engagement piece 410 of the rotation shaft 400 described later is formed in the slide portion 310 continuously with the elongated hole 314.

  The connecting portion 320 is a portion that connects the slide portion 310 and the release-side pressing portion 330, is disposed adjacent to the inner side in the front-rear direction of the pair of lock-side pressing surfaces 313, and faces upward from each locking-side pressing surface 313. Are formed so as to extend along the vertical direction. The connecting portion 320 is formed with such a width that a gap is formed between the connecting portion 320 and the distal end portion (second extending portion 220) of the lock gear 200 when the lock gear 200 is in the release posture. Thereby, when the lock gear 200 is released, the distal end portion of the lock gear 200 does not come into contact with the connecting portion 320, so that the release operation of the lock gear 200 can be performed smoothly.

  The release-side pressing portion 330 has a main body portion 331 formed in an arc shape along the inner peripheral surface of the internal gear 500, and a pair of contact portions 332 formed at both ends of the main body portion 331. ing. Each contact portion 332 is formed in a columnar shape, protrudes downward (inward in the radial direction) from the main body portion 331, and is configured such that an outer peripheral surface thereof contacts the release-side pressed surface 224.

  Since the abutment portion 332 that abuts against the release-side pressed surface 224 protrudes from the main body portion 331, the rigidity of the release-side press portion 330 as a whole can be increased. The pressing surface 224 can be suitably pressed. Further, since each contact portion 332 is formed in a columnar shape, sliding resistance between each contact portion 332 and each release-side pressed surface 224 can be reduced, so that the release operation of the lock gear 200 is performed smoothly. It is possible. Furthermore, by forming the main body portion 331 in an arc shape along the inner peripheral surface of the internal gear 500, for example, compared with a case where the main body portion is formed in a rectangular shape, interference between the main body portion 331 and the internal gear 500 is suppressed. It is possible.

  The rotation shaft 400 is a member for moving the slide cam 300 downward, and is configured to rotate in conjunction with an operation lever (not shown) operated by an occupant. The rotating shaft 400 has an engagement piece 410 that protrudes radially outward from the outer peripheral surface and engages with the engagement groove hole 315 of the slide cam 300 on a part of the outer peripheral surface. Accordingly, when the rotation shaft 400 is rotated clockwise in the figure when the lock gear 200 is in the locked posture, the engagement groove hole 315 is pressed downward by the engagement piece 410 and the slide cam 300 is moved downward. It is supposed to move.

  The internal gear 500 protrudes toward the base plate 100 from the outer peripheral portion of the disc portion 520 (see FIG. 9B) facing the base plate 100 in the axial direction, and has an inner tooth 510 on the inner peripheral side. And a ring-shaped internal tooth forming portion 530 having

  The disc portion 520 is a portion that forms a housing that accommodates each lock gear 200 and the slide cam 300 between the disc portion 520 and a portion corresponding to the recess 140 formed in the guide portion 120 of the base plate 100. A protrusion 540 that protrudes toward the base plate 100 is provided.

  The compression coil spring SP <b> 2 is a spring that biases the slide cam 300 toward the lock position, and is disposed between the slide cam 300 and the coupling portion 130 of the base plate 100. As a result, the urging force of the compression coil spring SP2 can be transmitted to each lock gear 200 via the slide cam 300, so that each lock gear 200 can be firmly engaged with the internal gear 500.

Next, the operation of the reclining mechanism 2 will be described in detail.
As shown in FIG. 9A, when the occupant operates the operation lever in the release direction in a state where the lock gears 200 are in the locked posture, the rotation shaft 400 rotates clockwise in the figure, so that the rotation shaft The engagement groove 410 of the slide cam 300 is pushed downward by the engagement piece 410 of 400, and the slide cam 300 moves downward from the lock position against the urging force of the compression coil spring SP2.

  Thereafter, as shown in FIG. 10, each contact portion 332 of the slide cam 300 that moves downward contacts the release-side pressed surface 224 of each lock gear 200 and moves the release-side pressed surface 224 downward. By pushing down, each lock gear 200 rotates from the locked position to the released position, and when the slide cam 300 reaches the released position, each lock gear 200 is in the released position.

  Further, when the occupant releases the hand from the operation lever in the state where each lock gear 200 is in the release posture, the slide cam 300 moves upward by the biasing force of the compression coil spring SP2. The slide cam 300 that moves upward first pushes the engagement surface 221 of each lock gear 200 upward at each contact surface 312, thereby rotating each lock gear 200 from the release posture to the lock posture.

  Thereafter, when the lock gears 200 are substantially locked, the contact surfaces 312 of the slide cams 300 are disengaged from the engagement surfaces 221 of the lock gears 200 and enter between the lock gears 200. As a result, each lock-side pressing surface 313 of the slide cam 300 moves so as to approach the lock-side pressed surface 222 of each lock gear 200, and each lock-side pressed surface 222 is pressed, whereby each lock gear 200. Is held in the locked position.

[Third Embodiment]
Next, a third embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In addition, since this embodiment changes a part of structure of the reclining mechanism 1 which concerns on 1st Embodiment mentioned above, about the component substantially the same as 1st Embodiment, the same code | symbol is attached | subjected. The description is omitted.

  As shown in FIGS. 11 and 12, the reclining mechanism 3 according to the third embodiment allows the lock gears 20 to move to each other when the slide cam 30 is moved from the release position (position of FIG. 11) toward the lock position. It is configured to mesh with the internal gear 50 at different timings (see FIGS. 12B and 12C). Accordingly, for example, compared to a structure in which the two lock gears 20 are simultaneously meshed with the internal gear 50 as in the first embodiment, the two lock gears 20 can be easily meshed with the internal gear 50. .

  Specifically, the reclining mechanism 3 according to the third embodiment differs from the first embodiment in that the first contact surface on the front side of the pair of first contact surfaces 31A and 31B formed on the slide cam 30 is different. The front end A1 of 31A is formed to be positioned above the rear end B1 of the rear first contact surface 31B. That is, when the slide cam 30 is located at the release position, the distance in the vertical direction from the front end A1 of the front first contact surface 31A to the front lock gear 20 is the rear first contact surface 31B. The inclinations of the first contact surfaces 31A and 31B are set so as to be larger than the distance in the vertical direction from the rear end B1 to the rear lock gear 20.

  In the third embodiment, the front lock gear 20 corresponds to the first lock gear, the front end A1 of the front first contact surface 31A corresponds to the first pressing portion, and the rear lock gear 20 Corresponds to the second lock gear, and the rear end B1 of the rear first contact surface 31B corresponds to the second pressing portion.

  According to this, since only the inclinations of the first contact surfaces 31A and 31B are made different, the timing at which each lock gear 20 meshes with the internal gear 50 can be shifted with a simple structure.

  Next, the operation of the reclining mechanism 3 will be described in detail. In the following description, for the sake of convenience, the reference numeral of the front lock gear 20 is also indicated as 20A, and the reference numeral of the rear lock gear 20 is also indicated as 20B.

  As shown in FIG. 11, when the operation lever held by the occupant is released in a state where each lock gear 20 is in the release posture, the urging force of the spiral spring SP (see FIG. 2) slides through the rotating cam 40. The slide cam 30 is transmitted to the cam 30 and moved downward. Then, before the first contact surface 31A on the front side of the slide cam 30 contacts the front lock gear 20A, the first contact surface 31B on the rear side contacts the lock gear 20B on the rear side, so that the front lock gear 20A. Prior to this, the rear lock gear 20B rotates.

  As shown in FIG. 12A, when the first contact surface 31A on the front side of the slide cam 30 contacts the front lock gear 20A, the front lock gear 20A starts to rotate with a delay from the rear lock gear 20B. As a result, as shown in FIGS. 12B and 12C, the rear lock gear 20B starts to mesh with the internal gear 50 before the front lock gear 20A, and the front lock gear 20A is delayed after this. Since it engages with the gear 50, each lock gear 20 can be easily engaged with the internal gear 50.

  Finally, as in the first embodiment, the lock gears 20 are pressed toward the lock posture by the second contact surfaces 32 of the slide cam 30 (see FIG. 3). In addition, since the operation | movement which rotates each lock gear 20 from a locked attitude | position to a releasing attitude | position is the same as that of 1st Embodiment, the description is abbreviate | omitted.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In addition, since this embodiment changes a part of structure of the reclining mechanism 1 which concerns on 1st Embodiment mentioned above, about the component substantially the same as 1st Embodiment, the same code | symbol is attached | subjected. The description is omitted.

  As shown in FIG. 13, the reclining mechanism 4 according to the fourth embodiment is different from the first embodiment in that a second biasing force is used instead of pressing each lock gear 20 toward the release posture with the slide cam 30. As an example of a member, each lock gear 20 is pressed toward the release posture by two leaf springs SP3.

  The leaf spring SP3 is provided between the guide portion 12 and the second extension portion 25 of the lock gear 20, and supports the second extension portion 25, thereby holding the lock gear 20 in the release posture.

  The leaf spring SP3 is set to an urging force smaller than the urging force of the spiral spring SP (see FIG. 2). Specifically, each of the slide cams 30 that move in the locking direction by the urging force of the spiral spring SP is more than the force that each locking gear 20 that rotates in the releasing direction by the urging force of each leaf spring SP3 presses the slide cam 30 upward. The urging forces of the leaf springs SP3 and the spiral springs SP are set so that the force that presses the lock gear 20 downward increases.

  The slide cam 30 is formed such that, when each lock gear 20 is in the release posture, its upper end 30a is separated downward from the second extension portion 25 of each lock gear 20, and the second extension of each lock gear 20 is provided. The portion 25 is configured not to be pressed in the release direction. Then, the slide cam 30 has a third position (a position in FIG. 14, hereinafter also referred to as a lock position) that presses each lock gear 20 toward the lock position, and each lock gear 20 by the leaf spring SP3 apart from the lock position. It is configured to be movable to a fourth position that permits the rotation (the position in FIG. 13, hereinafter also referred to as the release position).

Next, the operation of the reclining mechanism 4 according to the fourth embodiment will be described in detail.
As shown in FIG. 14, when the occupant operates the operation lever in the releasing direction against the urging force of the spiral spring SP in a state where each lock gear 20 is in the locked posture, the rotation cam 40 rotates clockwise in the figure. As a result, the slide cam 30 moves upward from the lock position.

  Thereafter, when the lower end portion of the slide cam 30 is pulled upward from between the lower end portions of the lock gears 20, the restriction of the rotation of the lock gears 20 in the release direction by the slide cam 30 is released, and the leaf springs SP3 are attached. Each lock gear 20 starts to rotate in the release direction due to the force. Then, as shown in FIG. 13, when the slide cam 30 moves to the release position, each lock gear 20 assumes the release posture.

  Further, when the occupant releases the hand from the operation lever in a state where each lock gear 20 is in the release posture, the rotating cam 40 is rotated counterclockwise by the urging force of the spiral spring SP, and the slide cam 30 is moved downward. Move to. When the lower end portion of the slide cam 30 comes into contact with the lower end portion of each lock gear 20, the slide cam 30 rotates each lock gear 20 in the locking direction against the urging force of each leaf spring SP3. Thereafter, by the same operation as in the first embodiment, the lower end portion of the slide cam 30 enters between the lower end portions of the lock gears 20, and the lock gears 20 are in the locked posture.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In addition, since this embodiment changes a part of structure of the reclining mechanism 1 which concerns on 1st Embodiment mentioned above, about the component substantially the same as 1st Embodiment, the same code | symbol is attached | subjected. The description is omitted.

  As shown in FIG. 15, the reclining mechanism 5 according to the fifth embodiment is different from the first embodiment in that a third urging force is used instead of pressing each lock gear 20 toward the lock posture with the slide cam 30. As an example of the member, each lock gear 20 is directly pressed toward the lock posture by a compression coil spring SP4. That is, in the fifth embodiment, a compression coil spring SP4 is provided instead of the spiral spring SP provided in the first embodiment.

  The compression coil spring SP4 is provided between the lower end portions of the lock gears 20 and applies an urging force to the lower end portions of the lock gears 20 in directions away from each other, thereby urging the lock gears 20 toward the lock posture. ing. Specifically, both ends of the compression coil spring SP4 are supported by a support shaft 24e protruding inward in the front-rear direction from the first surface 24b of each lock gear 20.

  The slide cam 30 is formed such that, when each lock gear 20 is in the locked posture (the posture of FIG. 16), its lower end 30b is separated upward from the lower end of each lock gear 20, and each lock gear 20 is locked in the locking direction. It is comprised so that it may not press on. The slide cam 30 has a fifth position (the position in FIG. 15, hereinafter also referred to as a release position) that presses each lock gear 20 toward the release posture, and is separated downward from the release position by the compression coil spring SP4. The lock gear 20 is configured to be movable to a sixth position that permits the rotation of the lock gear 20 (the position in FIG. 16, hereinafter also referred to as a lock position).

Next, the operation of the reclining mechanism 5 according to the fifth embodiment will be described in detail.
As shown in FIG. 15, when the occupant returns the operation lever to the original position (position for bringing the reclining mechanism 5 into the locked state) in a state where each lock gear 20 is in the release posture, the rotating cam 40 is not illustrated. It rotates clockwise and the slide cam 30 moves to the lower locking position. Thereby, each lock gear 20 held in the release posture by the slide cam 30 is rotated in the lock direction by the urging force of the compression coil spring SP4, and the lock posture is as shown in FIG. Note that moving the slide cam 30 to the lock position shown in FIG. 16 is not limited to the method of manually operating the operation lever to the original position as described above. For example, the rotation cam 40 is locked. A new spring for biasing in the direction may be provided, and a restricting portion for restricting the downward movement of the slide cam 30 at the lock position may be provided.

  In addition, when the occupant operates the operation lever in the release direction in a state where each lock gear 20 is in the locked posture, the rotation cam 40 rotates clockwise in the drawing, so that the slide cam 30 is directed upward from the lock position. Moving. Thereafter, when the upper end portion 36 of the slide cam 30 contacts the second extending portion 25 of each lock gear 20, the slide cam 30 rotates each lock gear 20 in the release direction against the urging force of the compression coil spring SP4. Then, as shown in FIG. 15, when the slide cam 30 moves to the release position, each lock gear 20 assumes the release posture.

  As mentioned above, this invention is not limited to each embodiment mentioned above, As shown in the following other forms, it can deform | transform suitably and can be implemented.

  In the first embodiment, the two regulated surfaces 22c and 22d are provided. However, the present invention is not limited to this, and the regulated surface is provided only on one of the first outer peripheral surface and the second outer peripheral surface. Also good. In this case, only one restriction surface need be provided.

  In each of the above embodiments, the base plate is fixed to the seat cushion and the internal gear is fixed to the seat back. However, the present invention is not limited to this, and the base plate is fixed to the seat back and the internal gear is fixed to the seat cushion. May be.

In the respective embodiments, although the provision two lock gears, the present invention is not limited thereto, for example, the lock gear is not good be one.

  In each of the above embodiments, the spiral spring SP and the compression coil spring are exemplified as the first biasing member. However, the present invention is not limited to this, and the first biasing member may be, for example, a torsion spring or a leaf spring. Good.

  In the third embodiment, the first abutting surfaces 31A and 31B have different inclinations, that is, the first pressing portion and the second pressing portion provided on the slide cam have different shapes, thereby moving the slide cam in the moving direction. Although the distance from the first pressing portion to the first lock gear and the distance from the second pressing portion to the second lock gear are different, the present invention is not limited to this. For example, the first pressing portion and the second pressing portion are formed in the same shape, and the shape of the contact portion with each pressing portion in the first lock gear and the second lock gear is made different so that the slide cam moves in the moving direction. You may comprise so that the distance from a 1st press part to a 1st lock gear may differ from the distance from a 2nd press part to a 2nd lock gear.

  In the fourth embodiment, the plate spring SP3 is exemplified as the second urging member. However, the present invention is not limited to this, and the second urging member is, for example, a torsion spring, a wire spring, a compression coil spring, or the like. Also good.

  In the fifth embodiment, the compression coil spring SP4 is exemplified as the third biasing member. However, the present invention is not limited to this, and the third biasing member is, for example, a torsion spring, a wire spring, a leaf spring, or the like. Also good.

  In each of the above embodiments, the reclining mechanism is applied to the vehicle seat S provided on the vehicle. However, the present invention is not limited to this, and the reclining mechanism can be applied to a seat provided on something other than the vehicle, such as a massage chair. You may apply.

  In the above embodiment, the slide cam 30 is configured to be movable along a straight line. However, the present invention is not limited to this, and for example, the slide cam is configured to be movable along a curved line that is slightly curved. Also good.

  In the above embodiment, the arcuate bulged portion 17 is exemplified as the sliding resistance reducing portion. However, the present invention is not limited to this, and for example, the surface of the base plate that is opposed to the lock gear is applied to the surface in order to make it slippery. The coating agent to be used may be a sliding resistance reducing unit.

DESCRIPTION OF SYMBOLS 1 Reclining mechanism 10 Base plate 20 Lock gear 30 Slide cam 40 Rotating cam 50 Internal gear S1 Seat cushion S2 Seat back

Claims (11)

A reclining mechanism for adjusting the inclination angle of the seat back with respect to the seat cushion,
A base plate fixed to one of the seat cushion and the seat back;
An internal gear fixed to the other of the seat cushion and the seat back and rotatable with respect to the base plate;
A lock gear rotatably supported by the base plate so as to be rotatable between a lock posture that meshes with the internal gear and a release posture that is disengaged from the internal gear;
A slide cam that is supported by the base plate so as to be movable along a predetermined line, and that presses the lock gear to bring the lock gear into the lock posture or the release posture;
An operation member for operating the slide cam, and a reclining mechanism.   The slide cam is configured to be movable between a first position that presses the lock gear toward the lock posture and a second position that presses the lock gear toward the release posture. Item 4. The reclining device according to Item 1.   The reclining device according to claim 2, further comprising a first urging member that urges the slide cam toward the first position. The base plate is fixed to the seat cushion;
The reclining device according to claim 2 or 3, wherein a moving direction of the slide cam is set in a vertical direction. Two lock gears are provided, and are configured to mesh with the internal gear at different timings when the slide cam is moved from the second position toward the first position. The reclining mechanism according to any one of claims 2 to 4. It said two lock gear is a first lock gear and the second lock gear,
The slide cam has a first pressing portion for pressing the first lock gear toward the locking posture, and a second pressing portion for pressing the second lock gear toward the locking posture,
When the slide cam is located at the second position, a distance from the first pressing portion to the first lock gear in a moving direction of the slide cam is a distance from the second pressing portion to the second lock gear. The reclining mechanism according to claim 5, which is different. A first urging member that urges the lock gear toward the lock posture via the slide cam;
A second biasing member that biases the lock gear toward the release posture,
The slide cam is movable to a third position that presses the lock gear toward the lock posture and a fourth position that allows the lock gear to rotate by the second biasing member away from the third position. The reclining device according to claim 1, wherein the reclining device is configured as follows. A third urging member that urges the lock gear toward the lock posture;
The slide cam is movable to a fifth position that presses the lock gear toward the release posture and a sixth position that allows the lock gear to rotate by the third biasing member away from the fifth position. The reclining mechanism according to claim 1, wherein the reclining mechanism is configured as follows. The base plate is disposed so as to be opposed to the slide cam in the axial direction of the internal gear, and to sandwich the slide cam in a direction that protrudes from the slide surface and is orthogonal to the moving direction of the slide cam. A pair of guide portions for guiding the slide cam;
The internal gear has a facing portion that faces the base plate in the axial direction, and a protruding portion that protrudes from the facing portion toward the base plate.
The rotation guide part which controls the rotation amount of the internal gear by restricting the movement of the projection part is provided in each guide part, The any one of Claims 1-8 characterized by the above-mentioned. The reclining mechanism according to claim 1.   The reclining mechanism according to claim 9, wherein a convex portion that protrudes on a side opposite to the internal gear is provided around the guide portion of the base plate.   11. A sliding resistance reducing portion for reducing sliding resistance with the lock gear is provided at a portion of the base plate facing the lock gear. The reclining mechanism according to the item.

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